package com.itheima.Controller;

import com.itheima.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.*;
import java.security.PublicKey;
import java.util.UUID;

/**
 * reggie-com.itheima.Controller
 * Administrator
 * 2023-03-09
 * 14:46
 */
@Slf4j
//@RestController
//@RequestMapping("/common")
public class CommonController {

    @Value("${regiee.path}")
    private String basePath;

    @PostMapping("/upload")
    public R upload(MultipartFile file){
        //file是一个临时文件，需要转存到指定位置，否则本次请求完成后临时文件会删除
        log.info(file.toString());

        //原始文件名
        String originalFilename = file.getOriginalFilename();//abc.jpg
        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));

        //使用UUID重新生成文件名，防止文件名称重复造成文件覆盖
        String fileName = UUID.randomUUID().toString() + suffix;//dfsdfdfd.jpg

        //创建一个目录对象
        File dir = new File(basePath);
        //判断当前目录是否存在
        if(!dir.exists()){
            //目录不存在，需要创建
            dir.mkdirs();
        }

        try {
            //将临时文件转存到指定位置
            file.transferTo(new File(basePath ,fileName));
        } catch (IOException e) {
            e.printStackTrace();
        }

        return R.success(fileName);
    }

    @GetMapping("/download")
    public  void download(String name, HttpServletResponse response) throws IOException {
        //输入流，通过输入流读取文件内容
        FileInputStream fileInputStream = new FileInputStream(new File(basePath + name));
        //输出流，通过输出流将文件写回浏览器
        ServletOutputStream outputStream = response.getOutputStream();
        response.setContentType("image/jpeg");

        int len=0;
        byte[] bytes = new byte[1024];
        while ((len=fileInputStream.read(bytes))!=-1){
            outputStream.write(bytes,0,len);
            outputStream.flush();
        }

        //关闭资源
        outputStream.close();
        fileInputStream.close();

    }


                                                                                                                                                                                                                                                  
}
